基于GIS的玉林-铁山港公路地质灾害危险性评价
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摘要
以玉林-铁山港高速公路崩塌和滑坡、岩溶塌陷地质灾害为研究对象,结合评价区实际情况,选取了12个具体的评价因子,其评判模型的影响因素集U={岩溶塌陷点数,滑坡和崩塌点数,地层岩性,断裂构造,岩土体结构,水文特征,地貌类型,地形坡度,地形坡向,年平均降雨量,地震,人类工程活动},确定了研究路段地质灾害危险性评价等级评判集V={轻度,中度,中高度,高度}。运用基于GIS技术的信息量法和MORPAS 3.0中信息量计算模块,对研究路段崩塌-滑坡、岩溶塌陷灾害进行了危险性评价:该段地质灾害危险性等级以轻度—中度为主,高度危险区仅在局部发育,公路沿线地质灾害易发程度弱—中等。综合评价结果与地质灾害发育情况现状和分布特征吻合较好。
According to the situation of Yulin-Tieshangang Highway,twelve assessment factors are selected.The risk evuluation standards of geological disasters include U={karst collapse number,collapse and landslide number,stratum lithology,faulted structure,rock-soil characteristic,hydrology geologic characteristics,geomorphological types,terrain slope,aspect,average annual rainfall,earthquake,human engineering activity}.The risk assessment can be divided into four grades:low grade,medium grade,medium-high grade,high grade.Based on GIS,the risk evaluation of collapse,landslide and karst collapse is carried out by the information value method and information value computation modle of MORPAS 3.0.The risk of the highway geological disasters takes low grade to medium grade as a main part,high grade area is only in partial section.The geological disasters trend is light to medium.The evaluation is in accordance with the investigation.
According to the situation of Yulin-Tieshangang Highway,twelve assessment factors are selected.The risk evuluation standards of geological disasters include U={karst collapse number,collapse and landslide number,stratum lithology,faulted structure,rock-soil characteristic,hydrology geologic characteristics,geomorphological types,terrain slope,aspect,average annual rainfall,earthquake,human engineering activity}.The risk assessment can be divided into four grades:low grade,medium grade,medium-high grade,high grade.Based on GIS,the risk evaluation of collapse,landslide and karst collapse is carried out by the information value method and information value computation modle of MORPAS 3.0.The risk of the highway geological disasters takes low grade to medium grade as a main part,high grade area is only in partial section.The geological disasters trend is light to medium.The evaluation is in accordance with the investigation.
引文
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[4]杜军,杨清华,严嘉.基于GIS与信息量法模型的汶川次生地质灾害危险性评价[J].地球科学——中国地质大学学报,2010,35(2):324-328.
[5]中国地质大学数学地质遥感地质研究所.MORPAS系统使用手册[K].武汉:中国地质大学,2005:6-20.
[6]赵鹏大.定量地学方法及应用[M].北京:高等教育出版社,2004:23-24.
[7]赵鹏大,胡旺亮,李紫金,等.矿床统计预测[M].北京:地质出版社,1994:57,124-125.
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